.van-nav-bar{
  border: 5px solid #000;
  display: flex;
  justify-content: space-between;
  text-align: center;
line-height: 50px;
}
.van-loading{
  width: 150px;
  height: 15px;
  margin: 0 auto;
  margin-top:100px;
}
.van-loading span{
  display: inline-block;
  width: 15px;
  height: 100%;
  margin-right: 5px;
  border-radius: 50%;
  background: lightgreen;
  -webkit-animation: load 1.04s ease infinite;
}
.van-loading span:last-child{
  margin-right: 0px; 
}
@-webkit-keyframes load{
  0%{
      opacity: 1;
  }
  100%{
      opacity: 0;
  }
}
.van-loading span:nth-child(1){
  -webkit-animation-delay:0.13s;
}
.van-loading span:nth-child(2){
  -webkit-animation-delay:0.26s;
}
.van-loading span:nth-child(3){
  -webkit-animation-delay:0.39s;
}
.van-loading span:nth-child(4){
  -webkit-animation-delay:0.52s;
}
.van-loading span:nth-child(5){
  -webkit-animation-delay:0.65s;
}